Good job on finishing!
Like others have mentioned, next time you tackle a platformer, look into coyote time, as I missed quite a few jumps by pressing space a fraction too late. Platformer toolkit by GMTK's Mark Brown goes into this stuff in detail, check it out!
I would also work on the camera next time. I dunno if it was just my screen, but I couldn't see the ground almost every time I jumped. You could fix this by lowering the camera overall slightly, and having a "Y band" where the camera's Y position doesn't move if the character is inside it, just so the camera doesn't move on regular jumps.
But still, great work and I hope you keep making games!